Date and Time dialog for when the clock isn't synced.

ash/system/chromeos/system_clock_observer.h

Index: ash/system/chromeos/system_clock_observer.h
diff --git a/ash/system/chromeos/system_clock_observer.h b/ash/system/chromeos/system_clock_observer.h
index dcc11eeca8239b3f550f4144f6c7e9d505be70df..8f7bfef2635ed349715984f4ffdca7492ece67e6 100644
--- a/ash/system/chromeos/system_clock_observer.h
+++ b/ash/system/chromeos/system_clock_observer.h
@@ -17,12 +17,16 @@ class SystemClockObserver
   SystemClockObserver();
   virtual ~SystemClockObserver();
 
-  // chromeos::SystemClockClient::Observer
+  // chromeos::SystemClockClient::Observer:
   virtual void SystemClockUpdated() OVERRIDE;
+  virtual void SystemClockCanSetTimeChanged(bool can_set_time) OVERRIDE;
 
-  // chromeos::system::TimezoneSettings::Observer
+  // chromeos::system::TimezoneSettings::Observer:
   virtual void TimezoneChanged(const icu::TimeZone& timezone) OVERRIDE;
 
+  // Queries the SystemClockClient for whether the time can be set.
+  bool SystemClockCanSetTime();
+
  private:
   DISALLOW_COPY_AND_ASSIGN(SystemClockObserver);
 };